The top banner is also a frame. It doesn't always render correctly as some images don't download. Reloading the frame changes how it looks;

The menu items in the left frame (once visible after a reload) generally work, but a couple of them ("System Maintenance / Firmware Upgrade" and "System Maintenance / Configuration Backup") give "Unable to connect" in the main frame;

The "Online Status" menu item only shows the first couple of lines (down to "System uptime", which updates periodically).